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Myzocallis (Lineomyzocallis) walshii (Monell), a North American aphid species associated with Quercus rubra was detected for the first time in Europe in 1988 (France), and subsequently in several other countries - Switzerland, Spain, Andorra, Italy, Belgium and Germany. Recent research in 2003-2005 recorded this aphid occurring throughout the Czech Republic. The only host plant was Quercus rubra. The highest aphid populations occurred in old parks and road line groves in urban areas, whereas the populations in forests were low. The seasonal occurrence of the light spring form and the darker summer form of M. (Lineomyzocal- lis) walshii as well as their different population peaks were noted. Four native parasitoids species (Praon flavinode (Haliday), Tri- oxys curvicaudus Mackauer, T. pallidus Haliday and T. tenuicaudus (Starý)) were reared from M. (Lineomyzocallis) walshii.

european journal of entomology

Myzocallis walshii (Hemiptera: Sternorrhyncha: Aphididae), an exotic invasive aphid on Quercus rubra, the American red oak: Its bionomy in the Czech Republic